“…In order to simplify the calculation of the Poincare map, the rotor position 0 rather than time t is selected as the independent variable of the system. Hence, the system equation becomes [11]: (2) where co is the rotor speed, ik(, VJk) and k (0, ik) (k =1, 2) are the kth phase current and flux linkage, R is the phase resistance, B is the viscous damping, J is the load inertia, T, is the load torque.…”